Effects of service environment and pre-deformation on the fatigue behaviour of 2524 aluminium alloy

The fatigue crack behavior of 7N01-T6 aluminum alloy in different particle environments

“…The CaO-particle, graphiteparticle, and Al 2 O 3 -particle environments have a minor effect on the ΔK cr value, but a 12.9% decrease in the ΔK cr value was found in the MnO 2 -particle environment. This contradicts the previous belief [28,29] that fatigue crack growth in its late stage is insensitive to both environment and microstructure. Our previous study [28] identified the fatigue crack propagation behavior of a 2524-T3 aluminium alloy in air, argon, NaCl fog, and exfoliation corrosion solution environments, which showed that these environments mainly affect the FCGRs on the early stage of crack propagation (i.e., low ∆K), and these environmental effects become very minor at ∆K > 20 MPa m 1/2 .…”

“…This contradicts the previous belief [28,29] that fatigue crack growth in its late stage is insensitive to both environment and microstructure. Our previous study [28] identified the fatigue crack propagation behavior of a 2524-T3 aluminium alloy in air, argon, NaCl fog, and exfoliation corrosion solution environments, which showed that these environments mainly affect the FCGRs on the early stage of crack propagation (i.e., low ∆K), and these environmental effects become very minor at ∆K > 20 MPa m 1/2 . Besides, Yin et al [29] also indicated the microstructure (such as grain size) effect on the FCGR of aluminium alloy gradually weakens with the increase of ∆K and is only limited at ∆K < 25 MPa m 1/2 .…”

“…If E p is smaller than that of aluminium alloys (i.e., E p < E Al ), such as with graphite particles (E gra ≈ 10 GPa) [28]) for which the ratio of E p to E Al (E p /E Al ) is ~ 13.9%, the particles could be crushed easily into tiny pieces during fatigue loading by the mating surfaces of crack, and scattered randomly over the fracture surfaces (Fig. 13c, d).…”

Effects of aging state on fatigue properties of 6A01 aluminum alloy

“…The fatigue performance of Al alloys is generally affected by two types of factors: external factors, such as service environment [13][14][15] and loading mode, 14,[16][17][18] and intrinsic factors, including grain size, inclusion size, and microstructure homogeneity. [18][19][20][21] Among them, internal defects often lead to the initiation of fatigue cracks and control their high-cycle fatigue (HCF) properties.…”

The fatigue crack growth behaviour of 2524‐T3 aluminium alloy in an Al2O3 particle environment

“…Al alloy is widely used in aerospace, railway and automotive engineering 1 due to its superior properties such as a low density and high strength-to-weight ratios; however, fatigue damage is a potential risk to the service safety of Al alloy. 2 It has already led to many fatal accidents that occur even at low stresses. Particularly, with the demand and development of rapid transportation vehicles, the security evaluation of aluminium alloy under fatigue loading is becoming more important.…”